Yang Weixia, Cheng Meijie, Han Yong, Luo Xueli, Li Chunhua, Tang Wenzhi, Yue Tianli, Li Zhonghong
College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, PR China.
College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, PR China; Laboratory of Quality & Safety Risk Assessment for Agro-products (Yangling), Ministry of Agriculture, Yangling, Shaanxi, 712100, PR China.
J Hazard Mater. 2021 Jan 5;401:123318. doi: 10.1016/j.jhazmat.2020.123318. Epub 2020 Jun 29.
Here, inspired by the poisoning process of heavy metal in human body that the accidental ingested heavy metal can anchor to the functional groups of DNA/protein/enzyme to exert their toxicities during the rapid blood circulation, we developed the adsorbent that enveloped Etched UiO-66 with abundant functional groups into chitosan (CTS) aerogel to capture Pb(II) and Cd(II) in aqueous and apple juice. SEM, XRD and FTIR spectra were used to characterize the Etched UiO-66/CTS aerogel. The results showed that Etched UiO-66/CTS aerogel has a three-dimensional porous structure, and -OH groups of CTS interact with Zr(IV) of Etched UiO-66 to form the stable UiO-66/CTS aerogel. Benefiting from the intrinsic properties of porous and abundant functional groups, Etched UiO-66/CTS aerogel exhibits satisfactory adsorption capacities of 654.9 mg g for Pb(II) and 343.9 mg g for Cd(II) at 45 °C. Moreover, the aerogel shows excellent removal efficiencies of 98.21% for Pb(II) and 98.70% for Cd(II) with initial concentration of 1.0 mg L in apple juice with little effect on the quality of apple juice. This strategy of mimetic heavy metal ions' poisoning behavior opens up a new avenue for the removal of heavy metal ions in complex matrices.
在此，受人体中重金属中毒过程的启发，即意外摄入的重金属在快速血液循环过程中可锚定到DNA/蛋白质/酶的官能团上发挥其毒性，我们开发了一种吸附剂，将具有丰富官能团的蚀刻UiO-66包裹在壳聚糖（CTS）气凝胶中，以捕获水相和苹果汁中的Pb(II)和Cd(II)。利用扫描电子显微镜（SEM）、X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）对蚀刻UiO-66/CTS气凝胶进行表征。结果表明，蚀刻UiO-66/CTS气凝胶具有三维多孔结构，CTS的-OH基团与蚀刻UiO-66的Zr(IV)相互作用形成稳定的UiO-66/CTS气凝胶。得益于多孔结构和丰富官能团的固有特性，蚀刻UiO-66/CTS气凝胶在45℃下对Pb(II)的吸附容量达654.9 mg/g，对Cd(II)的吸附容量达343.9 mg/g，表现出令人满意的吸附性能。此外，对于初始浓度为1.0 mg/L的苹果汁中的Pb(II)和Cd(II)，该气凝胶的去除效率分别高达98.21%和98.70%，且对苹果汁的品质影响很小。这种模拟重金属离子中毒行为的策略为去除复杂基质中的重金属离子开辟了一条新途径。
